Hallo!
I tried to add the capability to load a BeOS kernel. Unfortunately, in
the programmer manual there is a lot written about the boot sector but
nothing about loading a kernel. So I read the sources again and again
and tried some changes (see diff file included). There are two problems:
1. In "grub" (i.e. the command line tool) the BeOS kernel will be loaded
and the right size is indicated. But starting with "stage2" (i.e. real
boot) and typing "kernel = /boot/kernel/Zbeos" the loading is aborted
with an error message (sorry, I forgot the exact phrase) and typing it
once again the computer makes immediately a hard reset.
2. I don't know how to identify ("signature") a BeOS kernel. I didn't
find any kind of appropriate data in the header -- it all seems to be
code, except the loading message which I used to identify the kernel,
but this can change. (A free evaluation of BeOS is available from
<http://www.be.com/products/freebeos/>, from there I have the kernel and
the loader [BeOS is loaded from DOS via "loadbeos.com", which loads the
kernel to cs:0100 and jumps to cs:0100]).
Best wishes Jan
diff -urN grub-0.5.95.org/grub/asmstub.c grub-0.5.95/grub/asmstub.c
--- grub-0.5.95.org/grub/asmstub.c Sat May 20 23:35:20 2000
+++ grub-0.5.95/grub/asmstub.c Sun Sep 3 19:22:22 2000
@@ -633,6 +633,14 @@
}
+/* For BeOS kernels. */
+void
+beos_boot (void)
+{
+ stop ();
+}
+
+
/* booting a multiboot executable */
void
multi_boot (int start, int mbi)
diff -urN grub-0.5.95.org/stage2/asm.S grub-0.5.95/stage2/asm.S
--- grub-0.5.95.org/stage2/asm.S Sat Jun 3 08:08:05 2000
+++ grub-0.5.95/stage2/asm.S Sun Sep 3 19:16:27 2000
@@ -1676,6 +1676,26 @@
/*
+ * beos_boot()
+ *
+ * Does some funky things, then jumps to the
+ * entry point of the BeOS setup code.
+ */
+
+ENTRY(beos_boot)
+ /* don't worry about saving anything, we're committed at this point */
+ cld /* forward copying */
+
+ call EXT_C(prot_to_real)
+ .code16
+
+ /* jump to start */
+ ljmp $0x1000, $0x100
+
+ .code32
+
+
+/*
* multi_boot(int start, int mbi)
*
* This starts a kernel in the manner expected of the multiboot standard.
diff -urN grub-0.5.95.org/stage2/boot.c grub-0.5.95/stage2/boot.c
--- grub-0.5.95.org/stage2/boot.c Fri May 5 00:15:20 2000
+++ grub-0.5.95/stage2/boot.c Sun Sep 3 20:39:21 2000
@@ -317,6 +317,19 @@
else
errnum = ERR_WONT_FIT;
}
+ else if ((*((unsigned short *) (buffer + BOOTSEC_SIG_OFFSET))
+ == BOOTSEC_SIGNATURE)
+ && (!grub_memcmp(buffer + BEOS_SIG_OFFSET, BEOS_SIGNATURE,
+BEOS_SIG_LENGTH)))
+ {
+ int kernel_size;
+
+ grub_seek (0);
+/* cur_addr = BEOS_KERNEL; */
+ kernel_size = grub_read ((char *) BEOS_KERNEL, -1);
+ printf(" [BeOS, size=0x%x]\n", kernel_size);
+ grub_close();
+ return KERNEL_TYPE_BEOS;
+ }
else /* no recognizable format */
errnum = ERR_EXEC_FORMAT;
diff -urN grub-0.5.95.org/stage2/builtins.c grub-0.5.95/stage2/builtins.c
--- grub-0.5.95.org/stage2/builtins.c Thu Jun 1 08:26:52 2000
+++ grub-0.5.95/stage2/builtins.c Sun Sep 3 19:04:07 2000
@@ -213,6 +213,11 @@
big_linux_boot ();
break;
+ case KERNEL_TYPE_BEOS:
+ /* BeOS */
+ beos_boot();
+ break;
+
case KERNEL_TYPE_CHAINLOADER:
/* Chainloader */
diff -urN grub-0.5.95.org/stage2/shared.h grub-0.5.95/stage2/shared.h
--- grub-0.5.95.org/stage2/shared.h Tue May 30 17:58:09 2000
+++ grub-0.5.95/stage2/shared.h Sun Sep 3 19:06:09 2000
@@ -166,6 +166,15 @@
#define CL_OFFSET RAW_ADDR (0x90022)
/*
+ * BeOS stuff
+ */
+
+#define BEOS_SIG_OFFSET 0x1a6
+#define BEOS_SIG_LENGTH 14
+#define BEOS_SIGNATURE "Be Boot Loader"
+#define BEOS_KERNEL RAW_ADDR (0x10100)
+
+/*
* General disk stuff
*/
@@ -577,6 +586,9 @@
/* do some funky stuff, then boot bzImage linux */
void big_linux_boot (void) __attribute__ ((noreturn));
+/* do some funky stuff, then boot BeOS */
+void beos_boot (void) __attribute__ ((noreturn));
+
/* booting a multiboot executable */
void multi_boot (int start, int mbi) __attribute__ ((noreturn));
@@ -676,6 +688,7 @@
KERNEL_TYPE_BIG_LINUX, /* Big Linux. */
KERNEL_TYPE_FREEBSD, /* FreeBSD. */
KERNEL_TYPE_NETBSD, /* NetBSD. */
+ KERNEL_TYPE_BEOS, /* BeOS. */
KERNEL_TYPE_CHAINLOADER /* Chainloader. */
}
kernel_t;
